In order to solve the problems of water resources shortage, low water use efficiency and "white pollution" in arid sand areas, a field experiment on 2-year degradable mulch drip irrigation was carried out in Ulan Buh sandy area in Inner Mongolia. Two types of film mulch(degradable film and ordinary film)and three irrigation quotas(low water, moderate water and high water)were involved, and six treatments were resulted in total. The effects of irrigation treatment on maize plant height, leaf area index, yield, water consumption and water use efficiency(WUE)were identified. The results showed that there was no statistical significance in the height, leaf area index and yield in degradable mulch. Moreover, the water consumption after tasseling stage was large, but the WUE was significantly low. The irrigation quota in degradable mulch has important influence on maize plant height, leaf area index, yield, water consumption and WUE. The increase of irrigation quota can promote maize plant growth, delay late maize aging and increase the yield of maize. In 2-year high water treatments, the highest yields of maize are 13 614.97 kg/hm2 and 13 726.68 kg/hm2, respectively, but have no statistical significance from that in the moderate water treatment. The water consumption rose with increasing irrigation quota, while WUE increased in a parabolic function of irrigation quota. In 2-year moderate treatments, the largest WUE was reached, and it was 2.77% and 19.56% better in average than those in both low and high water treatments.
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